IIT Kharagpur - Indian Institute of Technology

Mentioned college are best on their own place. But, branches are different that you have entered. So, choose branch first which want to pursue. You may go for DTU if you have interest in computer. IIT Kharagpur is also option for you. Metallurgy is also better branch.

See the opening and closing rank you will get your answer. IIT, Indore has achieved 100% placements both in mechanical and computer science and 97% in electrical with a whopping package of 1.7 crores. CS average package is 15.5 lakhs. Indore is better city. It is well connected by airport. Placement get a advantage here. IIT, Indore has better coding culture. It has qualified two times for ACM ICPC. IIT Indore has best overall rank from India for all the ACM ICPCs held till now. IIT Indore has collaboration with CERN, so if you have good grades you get to intern at CERN.

Chemical Engineering is such a branch of engineering that it is offered only in selected top institutes in India. All IITs are good for it, especially old IITs such as IIT Madras, IIT Bombay, IIT Delhi and IIT Kanpur. Many top researchers and professors in Chemical Engineering are born in these institutes. Being a backbone of all fields, good exposure to courses and experiments is essential for becoming a good Chemical Engineer which is offered in IITs. Best Chemical engineering college in India:
IIT Bombay,
IIT Delhi,
IIT Kanpur,
IIT Kharagpur.

No, you can't not even if you have internationally published and recognized projects. They want GATE. I don't know if it's an IIT thing or an MHRD thing but a person who spends most of his/her day doing really good projects has little time to prepare for exams like GATE and are usually not the type who sit idle and study for an exam for a year after finishing their degree.
So if you're bright, a hard worker, and doing good research/project work, in India you are out of luck.

The admissions are done on the basis of JEE Main rank so to get a rough idea about the college you can get through below link:
https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor.

I would rather suggest you to go for IIT first and do not lose your 1 year in B.Tech. If you don't have the option right now then you should study and prepare for the entrance exam of IIT then if pass then further procedure will start.